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Ap F. ALLENDORFF INTERRUPTER FOR IGNITION DEVICES Filed Aug. 20., 1951 Patented Apr. 11, 1933 UNITED STATES PATENT OFFIC FRITZIALIIIENDORFF, OF STUTTGART, GERMANY, ASSIGNOR TO ROBERT BOSCH AKTIEN- GESELLSCHAFT, OF STUTTGART, GERMANY INTEBBUPTER FOR IGNITION DEVICES Application filed August 20, 1931, Serial No.

The present invention relates to the lubrication of circuit interrupters for ignition apparatus. Arrangements are known 1n which the arm of the circuitbreaker, which is revoluble about a pin, is lubricated by a the pivot in 3 of the circuit interrupter lever wick provided in a bore in the pin; this wick is not in communication with a large oil reservoir, but after the circuit breaker has been in operation for a certain period is periodically saturated with lubricant. A disadvantage of this construction is that, on the one hand, the wick is naturally too small for the reception of a quantity of oil suflicient to last a long time, whilst on the other hand, the danger exists that when saturating the wick with oil, too much oil is used for ensuring the lubrication of the bearing, the result being that the oil is sprayed around in the circuit breaker and the interrupter contacts become quickly worn out. According to the present invention, these drawbacks are avoided in that the wick of the bearing pin is placed in communication with a material saturated with lubricant which is arranged in an annular chamber eccentric to the axis of the circuit breaker.

An example of construction of the inventionis illustrated in the drawing, in which Figure 1 is a cross section through the circuit breaker shown diagrammatically.

Figure 2 is an elevation of the circuit breaker as seen from the driving side.

Figure 3 is a cross sectional view of a second form of construction.

Figure 4 is a cross sectional view of a third form of construction.

In the base plate 1 of a circuit breaker an annular groove 2 is cut on one side eccentric to the axis of rotation of the circuit breaker, the point of the groove which lies nearest to the axis of rotat on lying precisely opposite 4 mounte on the other side of the base plate.

The pin has a longitudinal bore 5 which connects the annular groove 2 to a transverse bore 6 in the pivot pin 3. In these bores is a wick 7 which is provided with a felt ring 8 which is arranged in a frame 9 of U-crosssection inserted in the annular groove 2 (Figure 1). The frame has on the one side an 558,408, and in Germany August 29, 1980.

opening 10 for the passage of the wick 7, and

-on the other side two lubricating holes 11 for the passage of make up lubricant. The felt ring 8 may of course be inserted n an annular groove without the frame 9,

v and this groove closed by a cover 12, as shown in Figure 3. The felt ring can also be arranged as shown in Figure 4, in a sheet metal casing 13 mounted on the circuit breaker plate which is not recessed.

The mode of working and the advantages obtained are as follows:

When the circuit breaker is rotating slowly and when stopped the lubricant sucked up by the felt ring 8 is uniformly distributed over the felt ring 8 so that the wick 7 can suck in the lubricant. When the speed of rotation increases, however, the lubricant flows in the felt ring under the action of centrif-' ugal force more and more to the place most remote from the circuit breaker axis. Consequently the lubricant is somewhat sucked back from the Wick 7, at least, the supply of fresh lubricant is stopped. Although it sounds contradictory that with an increasing speed i of rotation the supply of lubricant is decreased, 1t is of essential importance in the lubrication of circuit breakers that there should be a diminution of the supply of lubricant since this prevents a spreading out of the 011 when the speed of rotation is high, in the casing of the circuit breaker; this is very important because oil and oil vapours very much accelerate the wearing away of the contacts of the circuit breaker. The danger that too little lubricant may reach the bearing of the circuit breaker does not exist because the speeds of rotation usually vary very much and when a reduced speed of rotation occurs so much oil is again supplied that it sufiices for the always limited time of rapid travel.

'. By the invention the result is thus attained arm, a feltring eccentrically positioned on one side of said base plate, a wick connected to said felt ring, at its innermost part and adapted to supply lubricant to the said piv- 5 olal support.

2. Av circuit interrupter for ignition devices eoniprising a base plate having an eccentric groove therein, an interrupter arm, a ivotal support for said interrupter arm, a

felt ring positioned in the grooves in said base plate, a Wick connected to said felt ring and adapted to supply lubricant to the said pivotal support.

3. A circuit interrupter for ignition devices comprising a base plate, an interrupter arm. a pivotal support for said interru ter arm. a felt ring eccentrically positioned on said base. plate, a cap adapted to secure said l'elt ring on said base plate, a wick connected to said felt ring and adapted to supply lubrieant to the said pivotal support.

4. A circuit interrupter for ignition devices eon1prising a base plate, an interrupter arm,

a pivotal support on one side of said base plate for said interrupter arm, a longitudinal bore in said pivotal support,a transverse bore in said pivotal support, a felt ring eccentrieally positioned on the other side of said base plate and a. wick connected to said felt ring and positioned in said bores to supply lubricant to said pivotal support.

In testimony whereof I have hereunto allixed my signature.

FRITZ ALLENDORFF. 

